Example test showing usage of JenkinsPipelineUsage

[mkobit]

Sort of depends on one of:

• Add Retriever for testing pipeline steps of a project itself. jenkinsci/JenkinsPipelineUnit#64
• Update library loading so branch not required for localSource locations. jenkinsci/JenkinsPipelineUnit#75

Related to jenkinsci/JenkinsPipelineUnit#70

[mkobit]

Codegen in plugin might be a better option for now until the issue is released in JenkinsPipelineUnit

a com.lesfurets.jenkins.unit.global.lib.SourceRetriever (like from https://github.com/SAP/jenkins-library/blob/master/test/groovy/ProjectSource.groovy) could be implemented as part of the codegen